CN102303407B - Equipment and method for preparing polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching - Google Patents
Equipment and method for preparing polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching Download PDFInfo
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- CN102303407B CN102303407B CN 201110274669 CN201110274669A CN102303407B CN 102303407 B CN102303407 B CN 102303407B CN 201110274669 CN201110274669 CN 201110274669 CN 201110274669 A CN201110274669 A CN 201110274669A CN 102303407 B CN102303407 B CN 102303407B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
- B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to equipment and a method for preparing a polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching. The equipment comprises a base-band feeding unit, a longitudinal stretching unit, a transverse expanding and stretching unit, a curing and shaping unit and a cooling unit. The equipment is characterized in that: an arc stretching unit is arranged between the longitudinal stretching unit and the transverse expanding and stretching unit, and the arc stretching unit comprises multiple thermotanks which are identical with the longitudinal stretching unit; each thermotank is internally equipped with multiple olivary roller wheels; each roller wheel has two thin ends and one thick middle part; an angle alpha between a central axis of each roller wheel anda tangential line of a convex part in the middle of each roller wheel is 0-75 degrees; and the angle alpha between the central axis of each roller wheel and the tangential line of the convex positionin the middle of each roller wheel gradually becomes bigger along the running direction of a base band. Through the invention, the process and equipment are simple, the energy consumption is low, andthe processing process is environmentally-friendly; the aperture of the microporous membrane is highly controllable, the aperture difference is little, and the membrane thickness is uniform; and the method and equipment can be widely used for preparing PTFE, polyvinylidene fluoride (PVDF) and other microporous membranes, composite membranes and fiber.
Description
Technical field
The present invention relates to a kind of Apparatus and method for for preparing the polytetrafluoroethylene (PTFE) film, particularly prepare the Apparatus and method for of polytetrafluoroethylene film about a kind of three-dimensional stretching.
Background technology
In the prior art, usually adopt biaxial tension to prepare polytetrafluoroethylene film, its method is: ptfe micropowder and fluid lubricant → mix → sieve → maturation → pressed compact → push → extrude → roll into base band → degreasing (longitudinal stretching) → expanding (cross directional stretch) → sintering typing (curing) → finished film.Usually, the degreasing of polytetrafluoroethylene (PTFE) base band is adopted in the individual layer feeding single-unit baking oven, is provided with three spreading rolls that are arranged in parallel in the baking oven, the rotating speed difference of three spreading rolls, thereby the longitudinal stretching of realization base band; The expanding of polytetrafluoroethylene (PTFE) base band adopts as the device of utility model patent " plastic sheeting expanding be heating and curing device " described in (ZL99244710.0) and carries out, its characteristics are: adopt the Halogen lamp LED heating, adopt trapezoidal expanding guide rail to carry out expanding, film clamper on the expanding guide rail is cloth gripper, and cloth gripper is made circular motion under cloth gripper chain drives; The sintering typing of polytetrafluoroethylene (PTFE) base band is carried out in baking oven usually, and thermal source is infrared ray silicon plate.
In the said method, the polytetrafluoroethylene (PTFE) base band is attended by heating system when expanding, because base band is by cross directional stretch, tensile stress is progressively transmitted to central authorities by the base band both sides, therefore, cause film to present that both sides are thin, the trend of thick middle, and then cause transversely thickness inhomogeneous of film; In order to improve the uniformity of film, usually adopt Halogen lamp LED or other firing equipments that the heating of different temperatures is carried out in the both sides of film and central authorities, it is the heating-up temperature that the heating-up temperature of film central part is higher than position, film both sides, so that the cross directional stretch of film is carried out temperature to be replenished, make central authorities and the both sides expanding of film even, but realize the temperature control equipment more complicated of this different temperatures heating, realize difficulty, therefore, cause the temperature can not be precisely controlled, and then causing the film micropore aperture to be difficult to control, the uniformity of film that processes is poor.
The applicant had once applied for patent of invention " a kind of equipment and method for preparing the polytetrafluoroethylene film of biaxial tension " (CN101161446A), this unit comprises base band feeding unit, longitudinal stretching unit, horizontal expanding draw unit, solidifying and setting unit, cooling unit five parts, can process one or more layers film, energy consumption is lower than traditional equipment, micropore control better, and the film interlaminar bonding of preparation is good, is not easy layering; But find in the actual production process the even problem of uneven film thickness still can occur in horizontal expanding process, temperature controlled realization still has certain difficulty.
Summary of the invention
At the problems referred to above, the Apparatus and method for that the purpose of this invention is to provide a kind of three-dimensional preparation polytetrafluoroethylene film that stretches, this Apparatus and method for need not carry out the different heating temperature controlling to film central authorities and both sides when expanding, can significantly improve the uniformity of film, film micropore size and distribution are easy to control, device is simple, energy consumption is low, efficient is high, and is widely applicable.
For achieving the above object, the present invention takes following technical scheme: a kind of device of the three-dimensional preparation polytetrafluoroethylene film that stretches, it comprises base band feeding unit, longitudinal stretching unit, horizontal expanding draw unit, solidifying and setting unit and cooling unit, it is characterized in that: between described longitudinal stretching unit and the described horizontal expanding draw unit arc draw unit is set, described arc draw unit comprises the identical insulating box in some and described longitudinal stretching unit, is provided with some olivary running rollers that are in the described insulating box of every joint; Thick between the detail of described running roller two, the angle α of the middle part boss tangent line of the central axis of described running roller and described running roller is 0～75 °, and the angle α of the middle part boss tangent line of the central axis of each described running roller and described running roller becomes big gradually along the traffic direction of base band.
The outline line of the middle part boss of described running roller is circular arc line, parabola, hyperbola, and a kind of in the rounding between two oblique lines.
The angle α of the middle part boss tangent line of the central axis of described running roller and described running roller is 10～60 °.
Be provided with 1～3 in each described insulating box in the described arc draw unit and be olivary running roller.
A kind of three-dimensional stretching of said apparatus prepares the method for polytetrafluoroethylene film, it comprises base band feeding unit, longitudinal stretching unit, horizontal expanding draw unit, solidifying and setting unit and cooling unit, and it may further comprise the steps: 1) between longitudinal stretching unit and horizontal expanding draw unit the arc draw unit is set; 2) after the single or multiple lift base band is compound by a pair of feeding roller of base band feeding unit, send into the longitudinal stretching unit; 3) rotating speed of each carry-over pinch rolls becomes greatly gradually along the base band throughput direction in the longitudinal stretching unit, and base band gradually after the longitudinal stretching degreasing, is sent into the arc draw unit; 4) carry out arc stretching up or down by being olivary running roller in the arc draw unit, thick between the detail of olivary running roller two, the middle part projection of each running roller becomes big gradually along the base band throughput direction, be that the central axis of each running roller and the angle of running roller middle part boss tangent line become big gradually, base band is being carried out up or down when arc stretches, making the thickness at base band middle part be thinner than the thickness of both sides gradually; 5) base band after arc stretches is sent in the horizontal expanding draw unit,, along the cloth gripper guide rail operation that broadens gradually base band is also transmitted forward toward cross directional stretch gradually by cloth gripper; 6) will behind film process solidifying and setting unit and cooling unit that horizontal expanding draw unit obtains, obtain microporous membrane.
In the described step 4), being olivary roller speed is 80～1200 rev/mins, the heating-up temperature unanimity in the arc draw unit, and temperature is controlled between 300～400 ℃.
In the described step 5), laterally the expanding draw unit is divided into preheating A district, horizontal expanding B district, stablizes the C district; The temperature control in preheating A district is at 80～800 ℃, and laterally the control of the temperature in expanding B district is stablized the temperature control in C district at 250～320 ℃ at 100～300 ℃; The speed of cross directional stretch cloth gripper is 2～60 meters/minute.
In the described step 6), the temperature of solidifying and setting unit is controlled at 250～380 ℃, and the film hardening shaping time was 10～80 seconds.
Described base band is polytetrafluoroethylmicroporous microporous membrane, or is the composite membrane of polytetrafluoroethylene film and thermoplasticity moisture-permeable film.
The present invention is owing to take above technical scheme, it has the following advantages: 1, the present invention is owing to be provided with the arc draw unit between longitudinal stretching unit and horizontal expanding draw unit, in the arc draw unit, be provided with and be olivary running roller, therefore, can be after longitudinal stretching, on or below carrying out earlier to arc stretch, make the film interior thickness gradually less than thickness of two sides, and then carry out fabric width and stretch, avoided tensile stress progressively to be transmitted to central authorities by the base band both sides, it is thin to cause film to present both sides, the trend of thick middle, and then guaranteed the uniformity of film.2, the present invention is owing to be provided with the arc draw unit, can make the central thickness of film consistent with thickness of two sides, the temperature unanimity of whole arc draw unit, do not need the central authorities of film are carried out different heating and temperature control with both sides, therefore, not only make temperature control simple, and it is simple in structure, temperature control is convenient, has reduced energy resource consumption, simultaneously the micropore homogeneous and controllable of made film.3, be olivary running roller owing to being provided with in the arc draw unit of the present invention, improved common running roller in axial change of shape, on or below having realized film carried out to arc stretch, solved the problem in uneven thickness of film central authorities and both sides effectively, therefore, even, the even structure of the film thickness that adopts the inventive method to make, micropore and fabric width are controlled.4, the present invention is owing to be provided with base band feeding unit, by a pair of feeding roller in the base band feeding unit, not only can feed stretching to single or multiple lift PTFE base band, also can feed stretching to the composite membrane of polytetrafluoroethylene film and thermoplasticity moisture-permeable film; Particularly utilize to be olivary running roller and film is carried out arc to stretch in the arc draw unit, further improved the adhesive property between film and the film, therefore, the film interlaminar bonding of making by the inventive method is good, is not easy layering.The present invention can prepare the single or multiple lift film that comprises polytetrafluoroethylene (PTFE), and microporous membrane pore size controllability is strong, aperture difference is little, and film thickness is even, and the prepared film interlaminar bonding is good, is not easy layering, the production efficiency height; And technology of the present invention, equipment are simple, and energy consumption is low, and the process environmental protection can be widely used in the process of microporous barriers such as polytetrafluoroethylene (PTFE), Kynoar and fiber production.
Description of drawings
Fig. 1 is schematic flow sheet of the present invention
Fig. 2 is individual layer base band feeding longitudinal stretching cell schematics of the present invention
Fig. 3 is multilayer base band feeding longitudinal stretching cell schematics of the present invention
Fig. 4 is olive shape running roller schematic diagram of the present invention
Fig. 5 is olive shape running roller distortion schematic diagram of the present invention
Fig. 6 is the horizontal expanding draw unit of the present invention, solidifying and setting unit and cooling unit schematic diagram
Fig. 7 is the PTFE film that 3 D stereo of the present invention stretches and prepares
Fig. 8 is the PTFE film of traditional heating biaxial tension preparation
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1, apparatus of the present invention comprise base band feeding unit 1, longitudinal stretching unit 2, arc draw unit 3, horizontal expanding draw unit 4, solidifying and setting unit 5 and cooling unit 6.Characteristics of the present invention are mainly reflected in: increased arc draw unit 3 between longitudinal stretching unit 2 and the horizontal expanding draw unit 4, other unit and prior art are basic identical.
As Fig. 2, shown in Figure 3, base band feeding of the present invention unit 1 comprises that 1～3 is moved back film roller 11 and a pair of feeding roller 12, and base band 7 delivers into feeding roller 12 from moving back film roller 11.If base band 7 is multilayer, then from each move back film roller 11 deliver into compound with a pair of feeding roller 12 after, enter longitudinal stretching unit 2.
Longitudinal stretching of the present invention unit 2 comprises some joint gradient insulating boxs 21, is provided with some carry-over pinch rolls 22 in every joint insulating box 21.The speed of each carry-over pinch rolls 22 that arranges in every joint insulating box 21 becomes greatly gradually along the throughput direction of base band 7, with base band 7 longitudinal stretching gradually.Insulating box 21 adopts electrical heating, produces constant heating power by heat-generating pipe, and each temperature that saves in the insulating box 21 all is 200～450 ℃; Carry-over pinch rolls 22 are by the needs of change pulleys at different levels according to drawing effect, and the external diameter by changing roller, the distance between each roller and the rotating speed of each roller combine, and can realize the multiple tracks longitudinal stretching technology that non-constant speed luffing is wide.
Arc draw unit 3 of the present invention is identical with longitudinal stretching unit 2, also comprise some joint insulating boxs, be provided with some olivary running rollers 31 (shown in Fig. 4 a) that are in every joint insulating box, thick between running roller 31 two details, according to different processing requests, the angle α of the middle part boss tangent line of the central axis of running roller 31 and running roller 31 be 0～75 ° adjustable, preferred 10～60 °.The middle part projection of each running roller 31 in every joint insulating box becomes big gradually along the throughput direction of base band 7, the angle α that is the middle part boss tangent line of the central axis of each running roller 31 and running roller 31 becomes big gradually, on base band 7 is carried out or when arc lower stretches, make the thickness at base band 7 middle parts be thinner than the thickness of both sides gradually.
The shape of above-mentioned running roller 31 can be taked various versions, and running roller 31 can be a rotary body (shown in Fig. 4 b) that is obtained around 360 ° of x axle rotations by the oval symmetric figure that constitutes with two 2 α angles.In actual production, spheroid can adopt different major diameter and minor axis as required, and α can regulate and control preferred 10～60 ° in the angle between 10～75 ° simultaneously.According to different stretchings and stressed needs, the shape of running roller 31 can suitably be out of shape, the middle part raised profile line that is running roller 31 can be circular arc line, parabola (shown in Fig. 5 a), hyperbola (shown in Fig. 5 b), and rounding shapes such as (shown in Fig. 5 c) between two oblique lines.According to the difference that conduct heat to require, carry-over pinch rolls 31 can select stainless steel, aluminium alloy for use, mould unlike material such as wood makes.
As shown in Figure 6, horizontal expanding draw unit 4 of the present invention comprises preheating A district, horizontal expanding B district and stablizes the C district, laterally is being provided with the horizontal expanding device (not shown) with cloth gripper, cloth gripper guide rail and cloth gripper chain same as the prior art in the expanding draw unit 4.The A district of film in horizontal expanding draw unit 4 adopts the heating of controllable silicon plate, and surface temperature is 80～800 ℃, and film is constant substantially at A district insied width; The B district is trapezoidal horizontal expanding district, and temperature is 100～300 ℃ in the casing, and the B district can pass through the electrical heating of controllable silicon plate and heat-conducting oil heating air, and to blowing on the film, film will be stretched 2～15 times through the B district to hot-air through upper and lower two-layer nozzle; The C district is the stable region, and temperature is 250～320 ℃, and film remains unchanged through C district fabric width, progressively makes the internal structure homogenising under upper and lower hot blast effect.
As shown in Figure 6, solidifying and setting of the present invention unit 5 is solidifying and setting D district.By accurately thermograde being controlled the realization type-approval process, temperature is controlled at 250～380 ℃, and the film hardening shaping time was 10～80 seconds; Structures such as its fabric width, micropore keep stable after the film process solidifying and setting D district high-temperature process, uniformity and the intensity of film have been improved simultaneously, the D district adopts upper and lower to the blowing hot-air heating, and hot blast adopts Wick lifter of kerosine burner or electric hot plate, electrothermal tube etc. directly to add hot-air and forms.
As shown in Figure 6, cooling unit of the present invention 6 is for cooling E district, and is same as the prior art, and it is arranged on the insulating box outside, can make film cool to room temperature by air-cooled, cold water roller and the natural type of cooling cooling off the E district.
Base band feeding of the present invention unit 1, longitudinal stretching unit 2, arc draw unit 3, horizontal expanding draw unit 4, solidifying and setting unit 5 and cooling unit 6 can be used singly or in combination.
As shown in Figure 1, the inventive method may further comprise the steps:
1) polytetrafluorethylepowder powder is processed into the polytetrafluoroethylene (PTFE) base band according to this area method commonly used.
2) will need the base band that the stretches a pair of feeding roller 12 by base band feeding unit 1 compound after, send into longitudinal stretching unit 2, carry out degreasing (as Fig. 2, shown in Figure 3) by each carry-over pinch rolls 22 in the longitudinal stretching unit 2, longitudinal stretching unit 2 carries out in each joint insulating box 21, each speed that saves each carry-over pinch rolls 22 in the insulating box 21 becomes greatly gradually along the base band throughput direction, with base band longitudinal stretching degreasing gradually.
Above-mentioned base band comprises individual layer polytetrafluoroethylene (PTFE) base band, or the multilayer polytetrafluoroethylarticles base band, or the composite membrane of polytetrafluoroethylene film and thermoplasticity moisture-permeable film.Each insulating box 21 adopts electrical heating, and temperature is controlled separately, according to needs of production, the control of insulating box 21 temperature inside is between 200～450 ℃, carry-over pinch rolls 22 in every joint insulating box 21 are 3～6 not to be waited, 70～150 centimetres of carry-over pinch rolls 22 external diameters, its speed is adjustable between 50～1500 rev/mins.
3) the single or multiple lift film after the longitudinal stretching degreasing is sent in the arc draw unit 3, under same heating condition, carried out the arc stretching by being olivary running roller 31 (shown in Fig. 4 a) in the arc draw unit 3.Thick between olivary running roller 31 two details, the middle part projection of each running roller 31 in every joint insulating box becomes big gradually along the base band throughput direction, be that the central axis of each running roller 31 and the angle α of running roller middle part boss tangent line become big gradually, on base band 7 is carried out or in the arc lower stretching, make base band 7 interior thicknesses be thinner than the thickness of both sides gradually.The rotating speed of each running roller 31 in the olive shape running roller combination can be regulated according to producing needs, go up or the arc lower drawing process in, require difference can comprise 1～3 olive shape running roller 31 according to stretching.The rotating speed of olive shape running roller 31 is 80～1200 rev/mins.Arc draw unit 3 is carried out in insulating box 21, do not need the segmentation heating is carried out in centre and the both sides of base band, and the heating-up temperature unanimity, temperature is controlled between 300～400 ℃.
4) the single or multiple lift base band after arc stretches is sent on the cloth gripper in the horizontal expanding draw unit 4, cloth gripper is along the cloth gripper guide rail operation that broadens gradually, with base band 7 gradually toward cross directional stretch and transmit forward, respectively by preheating A district, horizontal expanding B district, stablize C district (as shown in Figure 6); Cross directional stretch cloth gripper speed is 2～60 meters/minute, and preheating A district temperature is controlled at 80～800 ℃, and laterally temperature control in expanding B district is stablized the temperature control of C district at 250～320 ℃ at 100～300 ℃.
5) will be behind single or multiple lift laminated film process solidifying and setting unit 5 and cooling unit 6 that horizontal expanding draw unit 4 obtains, obtain the individual layer polytetrafluoroethylmicroporous microporous membrane, or multilayer polytetrafluoroethylarticles composite porous film, or the composite membrane of polytetrafluoroethylene film and thermoplasticity moisture-permeable film.The temperature control of solidifying and setting unit 5 is at 250～380 ℃, and the time of film hardening typing was 10～80 seconds.
As Fig. 7, shown in Figure 8, PTFE film by 3 D stereo stretching preparation of the present invention is compared with the PTFE film of traditional heating biaxial tension preparation: the PTFE membrane fiberization of the inventive method preparation is effective, node between the monofilament is very little, not the zone that stretches fully seldom, the intensity of film and the PTFE fiber made thus thereof improves 50～100%; Microporous barrier porosity height, same thickness and pore size film voidage improve more than 15%; The micropore controllability is strong, and space structure is good, and average pore size can be adjustable in 0.08～5 mu m range; Micropore size evenly, pore-size distribution is narrow, minimax aperture deviation is reduced to 20～50% by original 100～200%; The film thickness that makes is even, and thickness can be adjustable at 10～100 μ m, and the left, center, right thickness difference is less than 5 μ m; The tradition deviation is greater than 20 μ m; The cross directional stretch distance, the wide 2.5m that reaches of made film web.
The various embodiments described above only are used for explanation the present invention, and wherein the structure of each parts, connected mode etc. all can change to some extent, and every equivalents and improvement of carrying out on the basis of technical solution of the present invention all should do not got rid of outside protection scope of the present invention.
Claims (10)
1. three-dimensional a stretching prepares the device of polytetrafluoroethylene film, it comprises base band feeding unit, longitudinal stretching unit, horizontal expanding draw unit, solidifying and setting unit and cooling unit, it is characterized in that: between described longitudinal stretching unit and the described horizontal expanding draw unit arc draw unit is set, described arc draw unit comprises the identical insulating box in some and described longitudinal stretching unit, is provided with some olivary running rollers that are in the described insulating box of every joint; Thick between the detail of described running roller two, the angle α of the middle part boss tangent line of the central axis of described running roller and described running roller is 0～75 °, and the angle α of the middle part boss tangent line of the central axis of each described running roller and described running roller becomes big gradually along the traffic direction of base band.
2. the device of a kind of three-dimensional preparation polytetrafluoroethylene film that stretches as claimed in claim 1, it is characterized in that: the outline line of the middle part boss of described running roller is circular arc line, parabola, hyperbola, and a kind of in the rounding between two oblique lines.
3. a kind of three-dimensional stretching as claimed in claim 1 prepares the device of polytetrafluoroethylene film, and it is characterized in that: the angle α of the middle part boss tangent line of the central axis of described running roller and described running roller is 10～60 °.
4. as the device of claim 1 or 2 or 3 described a kind of three-dimensional preparation polytetrafluoroethylene films that stretch, it is characterized in that: be provided with 1～3 in each the described insulating box in the described arc draw unit and be olivary running roller.
5. the three-dimensional as claim 1～4 device as described in each stretches and prepares the method for polytetrafluoroethylene film, it comprises base band feeding unit, longitudinal stretching unit, horizontal expanding draw unit, solidifying and setting unit and cooling unit, and it may further comprise the steps:
1) between longitudinal stretching unit and horizontal expanding draw unit, the arc draw unit is set;
2) after the single or multiple lift base band is compound by a pair of feeding roller of base band feeding unit, send into the longitudinal stretching unit;
3) rotating speed of each carry-over pinch rolls becomes greatly gradually along the base band throughput direction in the longitudinal stretching unit, and base band gradually after the longitudinal stretching degreasing, is sent into the arc draw unit;
4) carry out arc stretching up or down by being olivary running roller in the arc draw unit, thick between the detail of olivary running roller two, the middle part projection of each running roller becomes big gradually along the base band throughput direction, be that the central axis of each running roller and the angle of running roller middle part boss tangent line become big gradually, base band is being carried out up or down when arc stretches, making the thickness at base band middle part be thinner than the thickness of both sides gradually;
5) base band after arc stretches is sent in the horizontal expanding draw unit,, along the cloth gripper guide rail operation that broadens gradually base band is also transmitted forward toward cross directional stretch gradually by cloth gripper;
6) will behind film process solidifying and setting unit and cooling unit that horizontal expanding draw unit obtains, obtain microporous membrane.
6. a kind of three-dimensional stretching as claimed in claim 5 prepares the method for polytetrafluoroethylene film, it is characterized in that: in the described step 4), being olivary roller speed is 80～1200 rev/mins, the heating-up temperature unanimity in the arc draw unit, and temperature is controlled between 300～400 ℃.
7. prepare the method for polytetrafluoroethylene film as claim 5 or 6 described a kind of three-dimensional stretchings, it is characterized in that: in the described step 5), laterally the expanding draw unit is divided into preheating A district, horizontal expanding B district, stablizes the C district; The temperature control in preheating A district is at 80～800 ℃, and laterally the control of the temperature in expanding B district is stablized the temperature control in C district at 250～320 ℃ at 100～300 ℃; The speed of cross directional stretch cloth gripper is 2～60 meters/minute.
8. prepare the method for polytetrafluoroethylene film as claim 5 or 6 described a kind of three-dimensional stretchings, it is characterized in that: in the described step 6), the temperature of solidifying and setting unit is controlled at 250～380 ℃, and the film hardening shaping time was 10～80 seconds.
9. a kind of three-dimensional stretching as claimed in claim 7 prepares the method for polytetrafluoroethylene film, and it is characterized in that: in the described step 6), the temperature of solidifying and setting unit is controlled at 250～380 ℃, and the film hardening shaping time was 10～80 seconds.
10. prepare the method for polytetrafluoroethylene film as claim 5 or 6 or 9 described a kind of three-dimensional stretchings, it is characterized in that: described base band is polytetrafluoroethylmicroporous microporous membrane, or is the composite membrane of polytetrafluoroethylene film and thermoplasticity moisture-permeable film.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110274669 CN102303407B (en) | 2011-09-16 | 2011-09-16 | Equipment and method for preparing polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching |
| PCT/CN2012/000597 WO2013037180A1 (en) | 2011-09-16 | 2012-05-02 | Equipment and method for producing ptfe film by three dimensional stretching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110274669 CN102303407B (en) | 2011-09-16 | 2011-09-16 | Equipment and method for preparing polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching |
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| Publication Number | Publication Date |
|---|---|
| CN102303407A CN102303407A (en) | 2012-01-04 |
| CN102303407B true CN102303407B (en) | 2013-09-04 |
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| CN 201110274669 Active CN102303407B (en) | 2011-09-16 | 2011-09-16 | Equipment and method for preparing polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching |
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| WO (1) | WO2013037180A1 (en) |
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|---|---|---|---|---|
| CN102303407B (en) * | 2011-09-16 | 2013-09-04 | 中国人民解放军总后勤部军需装备研究所 | Equipment and method for preparing polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching |
| CN103212308A (en) * | 2012-08-01 | 2013-07-24 | 上海市凌桥环保设备厂有限公司 | Polytetrafluoroethylene millipore membrane for purifying PM2.5 |
| CN103285747B (en) * | 2013-04-11 | 2015-01-07 | 安吉县盛丰玻璃纤维有限公司 | Three-dimensional PTFE microporous membrane for filtration and preparation method thereof |
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| CN115256894B (en) * | 2022-08-04 | 2023-07-18 | 江西冠德新材科技股份有限公司 | Biaxially oriented film thickness control device and method |
| CN115230131B (en) * | 2022-09-19 | 2022-11-29 | 四川省众望科希盟科技有限公司 | Biaxial stretching device and method for improving uniformity of expanded polytetrafluoroethylene film |
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| US3874030A (en) * | 1973-03-08 | 1975-04-01 | Philip Morris Inc | Apparatus for spreading tows of fibrous materials |
| US4566154A (en) * | 1983-08-02 | 1986-01-28 | Scott Paper Company | Nonwoven web spreader |
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|---|---|
| WO2013037180A1 (en) | 2013-03-21 |
| CN102303407A (en) | 2012-01-04 |
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